Title: CPDLC - Proposed change to CPDLC ASN.1 UM189 

PDR Reference:                          		97080011
Originator Reference:                   		UM189
SARPs Document Reference:               		CPDLC SARPs, section 2.3.4.2.1 
Status:                                 		ADOPTED
PDR Revision Date:                      		22/09/97 (SUBMITTED -> ACCEPTED)
					06/10/97 (ACCEPTED -> PROPOSED)
					20/10/97 (PROPOSED -> RESOLVED)
PDR Submission Date:                    	18/08/97
Submitting State/Organization:          	Aerospatiale 
Submitting Author Name:                 	Frederic PRIEUR
Submitting Author E-mail Address:       	frederic.prieur@avions.aerospatiale.fr 
Submitting Author Supplemental 
Contact Information:                    		M. Frederic PRIEUR
                                        			A/BTE/SY/GGV
                                        			B0403
                                        			AEROSPATIALE
                                        			316, Route de Bayonne
                                        			31060 TOULOUSE, FRANCE
                                        			tel: 33 (0)5 61180368
                                        			fax: 33 (0)5 61938006
SARPs Date:                       		IV1.1, March 1997
SARPs Language:                         		English

Summary of Defect: 
The type of the CPDLC Uplink Message Element number 189 ('ADJUST SPEED TO [speed]') is NULL.

If the message definition is not changed, SARPs compliant implementations will not be able to exchange ADJUST SPEED TO messages.

Assigned SME:                           Sub-Volume II SME

Proposed SARPs amendment: 
The ASN.1 definition:

--   ADJUST SPEED TO [speed]       Urg(N)/Alr(M)/Resp(W/U)
     um189Speed                    [189] NULL,

must be change to:

--   ADJUST SPEED TO [speed]       Urg(N)/Alr(M)/Resp(W/U)
     um189Speed                    [189] Speed,


SME Recommendation to CCB:              -

CCB Decision:                           atnp_ccb_chair: SUBMITTED (18/08/97)
						     atnp_ccb_chair: ACCEPTED (22/09/97)
							atnp_ccb_chair: RESOLVED (20/10/97)